create a match, only allow someone at least 5 levels below you join and pretend to lag or be a total noob during the first 3-5 matches making sure your opponent wins at least 2-3 rounds. By then they should stick around for the entire match even though from the start you could one shot them each round.

Psychological manipulation ftw. Oldest trick in the book works on this shit too!

P.S. If it doesn't work you can always duel nude with level 1s World of Roguecraft style. They might stick around for the hell of it.